Mo Willems is the author of groundbreaking picture books, including; Knuffle Bunny: A Cautionary Tale (Caldecott Honor winner 2004); Don’t Let the Pigeon Drive the Bus! (Caldecott Honor winner 2003); Don’t Let the Pigeon Stay up Late!; The Pigeon Finds a Hot Dog!; Time to Say “Please”!; Leonardo, the Terrible Monster; Edwina, the Dinosaur Who Didn't Know She Was Extinct. He also wrote Today I will Fly! and My Friend Is Sad, the first books in this series. In his previous life, Mo was a six-time Emmy Award–winning writer and animator for Sesame Streetand the creator of Cartoon Network’s Sheep in the BigCity. He lives with his family in Brooklyn, New York.